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#include<bits/stdc++.h>
using namespace std;
#ifndef d
#define d(...)
#endif
#define st first
#define nd second
#define pb push_back
#define siz(c) (int)(c).size()
#define all(c) (c).begin(), (c).end()
typedef long long LL;
typedef long double LD;
constexpr int INF=1e9+7;
constexpr LL INFL=1e18;
template<class L, class R> ostream &operator<<(ostream &os, pair<L,R> P) {
  return os << "(" << P.st << "," << P.nd << ")";
}

int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	
	int n,cnt=0;
	cin>>n;
	for(int i=0;i<n;i++) {
		int a; cin>>a;
		cnt+=(a==1);
	}
	cout<<max(0,2-cnt)<<"\n";
	cout<<"2\n1 2\n";

	return 0;
}